ProPower Diesel 4" Muffler KTM 390 Duke Injector upgrades are required to

Injector upgrades are required to help increase spool up and performance with this kit

NOTE: You do not need to remove the handle from the Packout tray to insert the CST

Replaces OEM Part #: 706202045

raw aluminum

Properly Scaled to Match the Size of Your Truck - Rather than using the archaic “one-size-fits-all” approach

ProPower Diesel 4" Muffler KTM 390 Duke Injector upgrades are required toProPower Diesel 4" Muffler By Donaldson. This muffler is a straight through design that reduces drone without increasing backpressure or reducing horsepower. This muffler will fit with any 4" kit on the market including race pipes and full 4" exhausts, but will require cutting to fit.